Quick setting adjustable stop



June 5, 1962 F. cs. BURG 3,037,404

QUICK SETTING ADJUSTABLE STOP Filed July 1, 1960 zsheets-sheet 1 INVENTOR. [50 6. B026 BY JZ/m do! Zr m flT vE/VE YS June 5, 1962 F. e. BURG 3,037,404

QUICK SETTING ADJUSTABLE STOP Filed July 1, 1960 2 Sheets-Sheet 2 i /m am! Z/d/rn/ United States Patent Ofifice 3,037,404 Patented June 5, 1962 3,037,404 QUICK SETTING ADJUSTABLE STOP Fred G. Burg, Los Angeles, Calif., assignor to Burgmaster Corporation, Los Angeles, Calif., a corporation of California Filed July 1, 1960, Ser. No. 40,361 Claims. (Cl. 77-345) This invention relates to an adjustable abutment or stop, and more particularly to a stop that is intended to perform a controlling or indicating function when two moving parts reach a desired relative position. Thus, one of the two parts may carry a circuit controller and the other may carry the adjustable abutment. When the parts approach each other, the abutment operates the circuit controller.

One form of such an adjustable abutment is described in Patent No. 2,776,584, issued January 8, 1957, to Fred G. Burg, and particularly in FIG. 8. The abutment there shown is intended to determine how deep a drill may penetrate into the work. For this purpose, the abutment is adjustable in grooves formed on the periphery of a cylinder that is connected to the drill. As the drill advances, the abutment approaches a switch, and when the drill reaches the desired depth, the abutment operates the switch. The switch in turn may cause the advance of the drill to cease, or cause reversal of the feed of the drill.

It is on of the objects of this invention to simplify the process of adjusting the position of the abutment.

It is another object of the invention to improve, in

general, the adjustment mechanism for stops, abutments or similar devices.

This invention possesses many other advantages, and has other objects which may be made more clearly apparent from a consideration of one embodiment of the invention. For this purpose, there is shown a form in the drawings accompanying and forming part of the present specification. This form will now be described in detail, illustrating the general principles of the invention; but it is to be understood that this detailed description is not to be taken in a limiting sense, since the scope of the invention i's best defined by the appended claims.

Referring to the drawings:

FIGURE 1 is a fragmentary front view of an apparatus in which the invention is incorporated;

FIG. 2 is an enlarged fragmentary sectional view, taken along a plane corresponding to line 22 of FIG. 1;

FIG. 3 is an enlarged sectional View, taken along a plane corresponding to line 3-3 of FIG. 1;

FIG. 4 is an enlarged fragmentary front view of a device incorporating the invention;

FIG. 5 is a sectional view, taken along a plane corresponding to line 55 of FIG. 4; and

FIG. 6 is a view, similar to FIG. 5, illustrating the abutment structure in condition to be manually released for setting it.

The invention illustrated in the drawing is installed in connection with a machine tool shown and described in the prior patent above identified. This machine tool includes a supporting frame 1 and an angularly adjustable head 2 mounted for adjustment on horizontal axis 3.

A plurality of tools 25 are so arranged that any one of them may be brought into succession to operative relation with respect to the work. This is accomplished by the aid of apparatus disclosed in Patent No. 2,670,636, issued to Fred G. Burg, on March 2, 1954.

The head 2 is mounted for vertical movement on a movable carriage 2a. This carriage also supports a hollow tubular column 7 upon which are appropriately mounted the abutment stops for limiting the downward movement of the carriage and, accordingly, the extent to which any of the tools 25 may penetrate into the Work.

There are as many abutments 8 as there are tools 25 equiangularly mounted on member 7 (FIG. 3). propriate mechanism, the tubular member 7 is angularly moved synchronously with the angular adjustment of the head 2, all as explained in said prior patents.

The abutment 8 is intended to operate a control member 5 actuated by a stem 6. This control member 5, such as a microswitch, is shown as mounted on a cross brace 4 extending across the frame 1. Accordingly, when the appropriate abutment 8 depresses the stem 6, an electrical circuit may be controlled for causing retraction of the head 2 and to Withdraw the tool from the work.

Since all of the abutments 8 are similarly supported in an adjustable manner on the tubular member 7, description of one of them suflices for all.

Also equiangularly spaced about the axis 7a of the member 7 are the guiding members 10 supported in the bottom of slots 9. These guide members are provided with vertical flanges 12 overlying or extending beyond the vertical edges of the guide 10 proper. They are attached by cap screws 11 to the member 7. These cap screws are shown most clearly in FIGS. 1 and 2. They are placed at the top and bottom of each guide member 10; and the heads are countersunk so as to leave anunobstructed clear passage for the abutment carrier 14, now to be described.

As shown most clearly in FIGS. 2, 3, 4, 5 and 6, the vertical edge of each carrier 14 is provided with inwardly directed flanges 16 adapted to be located between the flanges 12 and the bottoms of the slots 9.

The carrier 14 is provided with a transverse slot 22 (FIG. 2) which is adapted to be aligned with any one of a plurality of horizontal slots 13 formed in the guide member 10.

Each carrier 14 is provided with a transverse bar -19 adapted to be engaged either in the slot 22 or in any one of the transverse slots 13. When in one of the slots 13, as in FIG. 5, the carrier 14 is restrained from vertical movement. A pair of springs 23, located in appropriate recesses in the body 14, urge the bar 19 against the guide 10. When the slot 22 is in alignment with one of the slots 13, the bar 19 is urged resiliently into the slot 13 and is held there by the resilient force.

For manipulating the carrier 14 so as to change the location of the carrier with respect to the slots 13, projections 20 and 21 are provided on each bar 19, and extend outwardly so as to make it possible to be grasped by the hand of an operator by pulling the bar 19 forward to a position illustrated in FIG. 6. The carrier 14 is thus freed from a slot 13 and then the carrier 14 may be moved either upwardly or downwardly along the guide 10.

The abutment 8 is in the form of a screw having a knurled head and capable of providing fine adjustment for determining the exact position when it is desired to stop the downward travel of the carriage 2a. In order to lock the adjustment, a set screw 18 (FIG. 2) is provided.

The outer surfaces of the projections 20 and 21 may similarly be knurled to facilitate grasping of these elements by the fingers of the operator.

The inventor claims:

1. In combination: a linear guide having transverse slots; a carrier slidable along the guide; a bar movable transversely of the slot for entering into any one of the slots for holding the carrier at a definite position; said bar having provisions for restricting movement of the bar longitudinally in the slots; resilient means carried by the carrier for urging the bar into a slot; and a member mounted in the carrier and capable of adjustment in the direction of travel of the carrier.

2. The combination as set forth in claim 1 in which the provisions for restricting movement of the bar longitudinally are extended ends for digital control of the bar.

By ap- 3. In combination: a linear guide having transverse slots; a carrier slidable along the guide; a bar movable transversally of the slot for entering into any one of the slots for holding the carrier at a definite position; said bar having provisions for restricting movement of the bar longitudinally in the slots; resilient means carried by the carrier for urging the bar into a slot; and an abutment screw threadedly engaging the carrier.

4. The combination as set forth in claim 3, in which the guide has edges engaged by the carrier for limiting said carrier to lengthwise movement along the guide.

5. In a depth stop for determining the travel of a tool device with respect to a work piece: an axially movable tool carrying member; a linear guide means mounted on the member and having a series of spaced transverse slots;

a carrier slidable along the guide means; a bar movable transversely of the slot for entering into any one of the slots for holding the carrier at a definite position; said bar having provisions for restricting movement of the bar longitudinally in the slots; resilient means mounted on the carrier for urging the bar into one of the slots; an abutment adjustably carried by the carriage; and a control member actuated by the abutment for terminating the movement of the tool carrying member.

References Cited in the file of this patent UNITED STATES PATENTS 2,776,584 Burg Jan. 8, 1957 

